﻿using log4net;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace YnPlcDataServer
{
    static class Program
    {
        private static readonly ILog logger = LogManager.GetLogger(typeof(Program));


        #region 应用只打开一次，避免打开多个应用
        /// <summary> 
        /// 该函数设置由不同线程产生的窗口的显示状态。 
        /// </summary> 
        /// <param name="hWnd">窗口句柄</param> 
        /// <param name="cmdShow">指定窗口如何显示。查看允许值列表，请查阅ShowWlndow函数的说明部分。</param> 
        /// <returns>如果函数原来可见，返回值为非零；如果函数原来被隐藏，返回值为零。</returns> 
        [DllImport("User32.dll")]
        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
        /// <summary> 
        /// 该函数将创建指定窗口的线程设置到前台，并且激活该窗口。键盘输入转向该窗口，并为用户改各种可视的记号。系统给创建前台窗口的线程分配的权限稍高于其他线程。 
        /// </summary> 
        /// <param name="hWnd">将被激活并被调入前台的窗口句柄。</param> 
        /// <returns>如果窗口设入了前台，返回值为非零；如果窗口未被设入前台，返回值为零。</returns> 
        [DllImport("User32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
        private const int WS_SHOWNORMAL = 1;

        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        #endregion

        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            Process instance = RunningInstance(); //应用只打开一次 
            if (instance == null)
            {
                logger.Info("数据中间件启动...");

                //SetAutoBootUp(AppConfig.App.BootUp);

                if (VerifyConfig())
                    Application.Run(new MainForm());
            }
            else
            {
                HandleRunningInstance(instance);
            }
        }
        private static bool VerifyConfig()
        {
            //    using (ProcessForm pf = new ProcessForm())
            //    {
            //        if (DialogResult.Cancel == pf.ShowDialog())
            //        { }
            //        else if (!pf.Result.Success)
            //        {
            //            MetroFramework.MetroMessageBox.Show(pf, pf.Result.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information, 160);
            //            using (SetupForm sf = new SetupForm())
            //            {
            //                return DialogResult.OK == sf.ShowDialog();
            //            }
            //        }
            //        else { return true; }
            //        return false;
            //    }
            return true;
        }

        #region 应用只打开一次，避免打开多个应用
        /// <summary> 
        /// 获取正在运行的实例，没有运行的实例返回null 
        /// </summary> 
        public static Process RunningInstance()
        {
            Process current = Process.GetCurrentProcess();
            Process[] processes = Process.GetProcessesByName(current.ProcessName);
            foreach (Process process in processes)
            {
                if (process.Id != current.Id)
                {
                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
                    {
                        return process;
                    }
                }
            }
            return null;
        }
        /// <summary> 
        /// 显示已运行的程序 
        /// </summary> 
        public static void HandleRunningInstance(Process instance)
        {
            MessageBox.Show("该应用系统已经在运行！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            if (instance.MainWindowHandle.ToInt64() > 0)
            {
                ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL); //显示，可以注释掉 
                SetForegroundWindow(instance.MainWindowHandle);            //放到前端 
            }
            else
            {
                IntPtr hWnd = FindWindow(null, "PLC数据采集服务系统");
                ShowWindowAsync(hWnd, WS_SHOWNORMAL);
                SetForegroundWindow(hWnd);
            }
        }
        #endregion
    }
}
